Single driver, no crossover and very efficient ... I'm going to say a resounding yes. I'm driving a pair of 7", single driver, crossover-less speakers from Omega (8ohms @ 95dB) with a Decware Taboo Mk II (6 watts) and it gets plenty loud with the dial only half way and I'm using it in a medium sized room.

The Taboo that I'm using requires more gain than the Rachel or even the Zen Select so I need a Preamp or Gain Stage to get the most out of it, so I'm betting the Rachel or Zen is going to be even louder that the 6 watt Taboo that I'm already using.

Thanks. I am going to go the 'Vulcan' route- designed by the same guy it appears and the plans cost money vs the other design but that's ok.My Rachael/HE-500 experiment was a failure I am afraid. Horrible sound through the planers- muddy, muffled, little detail, no punch vs the Shiit Asgard. Like listening with a half dozen potato sacks between the headphones and your ears. A night and day difference and maybe indicates solid state with the planers is the way to go.I look forward to using these speakers.

Jamc- Please keep posting regarding this project. I purchased a set of Fostex 206 years ago when I bought my original Zen amp kit. Built the amp (which is awesome) but never did anything with the drivers. I am now in the process of selling off my electronics to purchase a whole Decware rig and the Vulcan design seems very interesting. Thanks for rekindling the Fostex idea.

I can't relay much about Fostex, but I think that it is safe to say sensitivity of the driver gives a good idea as to what it takes to drive them. Using the FRX2, which is an 8" driver, I have just what I need at 3/4 volume using higher gain input tubes(6N2P vs 6N1P). I would be the first to mention if there wasn't enough bass, and in this case, there is no problem. Most all of the audible frequency range is being driven with authority.

Quick update- Vulcan speakers are built but only used at work with an Emotiva a-100 50W amp and Bottlehead Quickie battery powered tube preamp from Mac with Audirvana Plus. Barely turn the amp volume and lots of sound- clean, clear, a little weak in bass but I can tweak the wool felt dampening in the enclosure. Not used with the Rachael yet but driving the speakers will not be an issue- I read that a speaker with 95 dB sensitivity can be driven loud (100 dB) with only 3W... these enclosures are big- 73-1/2" H x 11-1/2"W x 18" D. Made the outriggers for stability out of 1/2" x 2" steel strap, drilled and tapped for 3/8-16 bolts for plumb adjustment ;D

That is a good number. By the look of the cabinet, there is good volume as well. Maybe I missed it, but is the cabinet vented? I found that there is a certain amount of damping material that spreads out the Q, but exceeding it starts to drop the bass output. I imagine that the type of damping material also plays a factor.

The Vulcan design is very appealing to me once I got a look at it. Simple in nature, and yet can be worked with using a variety of damping materials. The ultra soft F26 felt would be my guess to use, if in fact, it has enough body to it, and is not compressed. Any damping material would be better suited if it were to have a body of 2". I am thinking of the consistency that fiberglass insulation or rock wool has. Placement into the room may help the balance for the bass, but of course, experimentation is needed. I am curious to hear your impressions.

"Sneek?" "Sneekes?" "We doesn't sneeks master." Oh, but Gollum told them in the Hobbit. I tried to sneek a new CD player into the living room. It was easier 'cuz it was black...just like the piece before it. But when I tried to sneek in Rachael, there wasn't a chance. You might try hiding them behind those large green drapes that you have. Otherwise, brace yourself.